/*
 * File: gwindow.h
 * ---------------
 * This file defines the <code>GWindow</code> class which supports
 * drawing graphical objects on the screen.
 */

#ifndef _gwindow_h
#define _gwindow_h

#include <string>
#include "gtypes.h"
#include "vector.h"

class GCompound;
class GInteractor;
class GLabel;
class GObject;

/*
 * Friend type: GWindowData
 * ------------------------
 * This block contains all data pertaining to the window.  Shallow copying
 * of the <code>GWindow</code> object ensures that all copies refer to the
 * same onscreen window.
 */

struct GWindowData {
   double windowWidth;
   double windowHeight;
   std::string windowTitle;
   std::string color;
   bool visible;
   GCompound *top;
};

/*
 * Class: GWindow
 * --------------
 * This class represents a graphics window that supports simple graphics.
 * Each <code>GWindow</code> consists of two layers.  The background layer
 * provides a surface for drawing static pictures that involve no animation.
 * Graphical objects drawn in the background layer are persistent and do
 * not require the client to update the contents of the window.  The
 * foreground layer contains graphical objects that are redrawn as necessary.
 *
 * <p>The <code>GWindow</code> class includes several methods that draw
 * lines, rectangles, and ovals on the background layer without making
 * use of the facilities of the <code>gobjects.h</code> interface.  For
 * example, the following program draws a diamond, rectangle, and oval
 * at the center of the window.
 *
 *<pre>
 *    int main() {
 *       GWindow gw;
 *       cout << "This program draws a diamond, rectangle, and oval." << endl;
 *       double width = gw.getWidth();
 *       double height = gw.getHeight();
 *       gw.drawLine(0, height / 2, width / 2, 0);
 *       gw.drawLine(width / 2, 0, width, height / 2);
 *       gw.drawLine(width, height / 2, width / 2, height);
 *       gw.drawLine(width / 2, height, 0, height / 2);
 *       gw.setColor("BLUE");
 *       gw.fillRect(width / 4, height / 4, width / 2, height / 2);
 *       gw.setColor("GRAY");
 *       gw.fillOval(width / 4, height / 4, width / 2, height / 2);
 *       return 0;
 *    }
 *</pre>
 *
 * A <code>GWindow</code> object may be freely copied, after which all
 * copies refer to the same window.
 */

class GWindow {

public:

/*
 * Constructor: GWindow
 * Usage: GWindow gw;
 *        GWindow gw(width, height);
 * ---------------------------------
 * Creates a window, either of the specified size or a default size.
 */

   GWindow();
   GWindow(double width, double height);

/*
 * Destructor: ~GWindow
 * --------------------
 * Reclaims the internal storage for the window.  Note that the window
 * is not closed by this operation, but persists until it is closed by
 * the client or the user exits the program.
 */

   virtual ~GWindow();

/*
 * Method: close
 * Usage: gw.close();
 * ------------------
 * Deletes the window from the screen.
 */

   void close();

/*
 * Method: requestFocus
 * Usage: gw.requestFocus();
 * -------------------------
 * Asks the system to assign the keyboard focus to the window, which
 * brings it to the top and ensures that key events are delivered to
 * the window.  Clicking in the window automatically requests the focus.
 */

   void requestFocus();

/*
 * Method: clear
 * Usage: gw.clear();
 * ------------------
 * Clears the contents of the window.
 */

   void clear();

/*
 * Method: setVisible
 * Usage: gw.setVisible(flag);
 * ---------------------------
 * Determines whether the window is visible on the screen.
 */

   void setVisible(bool flag);

/*
 * Method: isVisible
 * Usage: if (gw.isVisible()) ...
 * ------------------------------
 * Tests whether the window is visible.
 */

   bool isVisible();

/*
 * Method: drawLine
 * Usage: gw.drawLine(p0, p1);
 *        gw.drawLine(x0, y0, x1, y1);
 * -----------------------------------
 * Draws a line connecting the specified points.
 */

   void drawLine(const GPoint & p0, const GPoint & p1);
   void drawLine(double x0, double y0, double x1, double y1);

/*
 * Method: drawPolarLine
 * Usage: GPoint p1 = gw.drawPolarLine(p0, r, theta);
 *        GPoint p1 = gw.drawPolarLine(x0, y0, r, theta);
 * ------------------------------------------------------
 * Draws a line of length <code>r</code> in the direction <code>theta</code>
 * from the initial point.  The angle <code>theta</code> is measured in
 * degrees counterclockwise from the +<i>x</i> axis.  The method returns
 * the end point of the line.
 */

   GPoint drawPolarLine(const GPoint & p0, double r, double theta);
   GPoint drawPolarLine(double x0, double y0, double r, double theta);

/*
 * Method: drawOval
 * Usage: gw.drawOval(bounds);
 *        gw.drawOval(x, y, width, height);
 * ----------------------------------------
 * Draws the frame of a oval with the specified bounds.
 */

   void drawOval(const GRectangle & bounds);
   void drawOval(double x, double y, double width, double height);

/*
 * Method: fillOval
 * Usage: gw.fillOval(bounds);
 *        gw.fillOval(x, y, width, height);
 * ----------------------------------------
 * Fills the frame of a oval with the specified bounds.
 */

   void fillOval(const GRectangle & bounds);
   void fillOval(double x, double y, double width, double height);

/*
 * Method: drawRect
 * Usage: gw.drawRect(bounds);
 *        gw.drawRect(x, y, width, height);
 * ----------------------------------------
 * Draws the frame of a rectangle with the specified bounds.
 */

   void drawRect(const GRectangle & bounds);
   void drawRect(double x, double y, double width, double height);

/*
 * Method: fillRect
 * Usage: gw.fillRect(bounds);
 *        gw.fillRect(x, y, width, height);
 * ----------------------------------------
 * Fills the frame of a rectangle with the specified bounds.
 */

   void fillRect(const GRectangle & bounds);
   void fillRect(double x, double y, double width, double height);

/*
 * Method: setColor
 * Usage: gw.setColor(color);
 * --------------------------
 * Sets the color used for drawing.  The <code>color</code> parameter is
 * usually one of the predefined color names:
 *
 *    <code>BLACK</code>,
 *    <code>BLUE</code>,
 *    <code>CYAN</code>,
 *    <code>DARK_GRAY</code>,
 *    <code>GRAY</code>,
 *    <code>GREEN</code>,
 *    <code>LIGHT_GRAY</code>,
 *    <code>MAGENTA</code>,
 *    <code>ORANGE</code>,
 *    <code>PINK</code>,
 *    <code>RED</code>,
 *    <code>WHITE</code>, and
 *    <code>YELLOW</code>.
 *
 * The case of the individual letters in the color name is ignored, as
 * are spaces and underscores, so that the color <code>DARK_GRAY</code>
 * can be written as <code>"Dark Gray"</code>.
 *
 * <p>The color can also be specified as a string in the form
 * <code>"#rrggbb"</code> where <code>rr</code>, <code>gg</code>, and
 * <code>bb</code> are pairs of hexadecimal digits indicating the
 * red, green, and blue components of the color.
 */

   void setColor(std::string color);
   void setColor(int color);

/*
 * Method: getColor
 * Usage: string color = gw.getColor();
 * ------------------------------------
 * Returns the current color as a string in the form <code>"#rrggbb"</code>.
 * In this string, the values <code>rr</code>, <code>gg</code>,
 * and <code>bb</code> are two-digit hexadecimal values representing
 * the red, green, and blue components of the color, respectively.
 */

   std::string getColor();

/*
 * Method: getWidth
 * Usage: double width = gw.getWidth();
 * ------------------------------------
 * Returns the width of the graphics window in pixels.
 */

   double getWidth();

/*
 * Method: getHeight
 * Usage: double height = gw.getHeight();
 * --------------------------------------
 * Returns the height of the graphics window in pixels.
 */

   double getHeight();

/*
 * Method: repaint
 * Usage: gw.repaint();
 * --------------------
 * Schedule a repaint on this window.
 */

   void repaint();

/*
 * Method: setWindowTitle
 * Usage: gw.setWindowTitle(title);
 * --------------------------------
 * Sets the title of the graphics window.
 */

   void setWindowTitle(std::string title);

/*
 * Method: getWindowTitle
 * Usage: string title = gw.getWindowTitle();
 * ------------------------------------------
 * Returns the title of the graphics window.
 */

   std::string getWindowTitle();

/*
 * Method: draw
 * Usage: gw.draw(gobj);
 *        gw.draw(gobj, x, y);
 * ---------------------------
 * Draws the <code>GObject</code> on the background layer.  For convenience,
 * the <code>gobj</code> parameter may be passed either as a constant
 * reference or as a pointer.  If the <code>x</code> and <code>y</code>
 * parameters are included, the object is moved to that location before
 * drawing.
 */

   void draw(const GObject & gobj);
   void draw(GObject *gobj);
   void draw(const GObject *gobj);
   void draw(GObject & gobj, double x, double y);
   void draw(GObject *gobj, double x, double y);

/*
 * Method: add
 * Usage: gw.add(gobj);
 *        gw.add(gobj, x, y);
 * --------------------------
 * Adds the <code>GObject</code> to the foreground layer of the window.
 * The second form of the call sets the location of the object to
 * (<code>x</code>, <code>y</code>) first.
 *
 * <p>In terms of memory management, adding a <code>GObject</code> pointer to
 * a <code>GWindow</code> transfers control of that object from the client to
 * the window manager.  Deleting a <code>GWindow</code> automatically deletes
 * any <nobr><code>GObject</code><font size=-1>s</font></nobr> it contains.
 */

   void add(GObject *gobj);
   void add(GObject *gobj, double x, double y);

/*
 * Method: remove
 * Usage: gw.remove(gobj);
 * -----------------------
 * Removes the object from the window.
 */

   void remove(GObject *gobj);

/*
 * Method: addToRegion
 * Usage: gw.addToRegion(interactor, region);
 * ------------------------------------------
 * Adds the interactor (which can also be a <code>GLabel</code>) to
 * the control strip specified by the <code>region</code> parameter.
 * The <code>region</code> parameter must be one of the strings
 * <code>"NORTH"</code>, <code>"EAST"</code>, <code>"SOUTH"</code>,
 * or <code>"WEST"</code>.
 */

   void addToRegion(GInteractor *gobj, std::string region);
   void addToRegion(GLabel *gobj, std::string region);

/*
 * Method: removeFromRegion
 * Usage: gw.removeFromRegion(interactor, region);
 * -----------------------------------------------
 * Adds the interactor (which can also be a <code>GLabel</code>) to
 * the control strip specified by the <code>region</code> parameter.
 * The <code>region</code> parameter must be one of the strings
 * <code>"NORTH"</code>, <code>"EAST"</code>, <code>"SOUTH"</code>,
 * or <code>"WEST"</code>.
 */

   void removeFromRegion(GInteractor *gobj, std::string region);
   void removeFromRegion(GLabel *gobj, std::string region);

/*
 * Method: getGObjectAt
 * Usage: GObject *gobj = getGObjectAt(x, y);
 * ------------------------------------------
 * Returns a pointer to the topmost <code>GObject</code> containing the
 * point (<code>x</code>, <code>y</code>), or <code>NULL</code> if no such
 * object exists.
 */

   GObject *getGObjectAt(double x, double y);

/*
 * Method: setRegionAlignment
 * Usage: gw.setRegionAlignment(region, align);
 * --------------------------------------------
 * Sets the alignment of the specified side region as specified by the
 * string <code>align</code>.  The <code>region</code> parameter must be
 * one of the strings <code>"NORTH"</code>, <code>"EAST"</code>,
 * <code>"SOUTH"</code>, or <code>"WEST"</code> and the <code>align</code>
 * parameter must be <code>"LEFT"</code>, <code>"RIGHT"</code>, or
 * <code>"CENTER"</code>.  By default, side panels use
 * <code>CENTER</code> alignment.
 */

   void setRegionAlignment(std::string region, std::string align);

/*
 * Operator: ==
 * Usage: if (w1 == w2) ...
 * ------------------------
 * Checks whether the two objects refer to the same window.
 */

   bool operator==(GWindow w2);

/*
 * Operator: !=
 * Usage: if (w1 != w2) ...
 * ------------------------
 * Checks whether the two objects refer to different windows.
 */

   bool operator!=(GWindow w2);

/* Private section */

/**********************************************************************/
/* Note: Everything below this point in the file is logically part    */
/* of the implementation and should not be of interest to clients.    */
/**********************************************************************/

   explicit GWindow(bool visible);
   GWindow(double width, double height, bool visible);
   GWindow(GWindowData *gwd);

private:

/* Instance variables */

   GWindowData *gwd;

/* Private methods */

   void initGWindow(double width, double height, bool visible);

   friend class Platform;
   friend class GKeyEvent;
   friend class GMouseEvent;
   friend class GWindowEvent;

};

/*
 * Function: repaint
 * Usage: repaint();
 * -----------------
 * Issues a request to update all graphics windows.  This function
 * is called automatically when the program pauses, waits for an
 * event, waits for user input on the console, or terminates.  As
 * a result, most clients never need to call repaint explicitly.
 */

void repaint();

/*
 * Function: pause
 * Usage: pause(milliseconds);
 * ---------------------------
 * Pauses for the indicated number of milliseconds.  This function is
 * useful for animation where the motion would otherwise be too fast.
 */

void pause(double milliseconds);

/*
 * Function: getScreenWidth
 * Usage: width = getScreenWidth();
 * --------------------------------
 * Returns the width of the entire display screen.
 */

double getScreenWidth();

/*
 * Function: getScreenHeight
 * Usage: height = getScreenHeight();
 * ----------------------------------
 * Returns the height of the entire display screen.
 */

double getScreenHeight();

/*
 * Function: convertColorToRGB
 * Usage: int rgb = convertColorToRGB(colorName);
 * ----------------------------------------------
 * Converts a color name into an integer that encodes the
 * red, green, and blue components of the color.
 */

int convertColorToRGB(std::string colorName);

/*
 * Function: convertRGBToColor
 * Usage: int colorName = convertRGBToColor(rgb);
 * ----------------------------------------------
 * Converts an <code>rgb</code> value into a color name in the
 * form <code>"#rrggbb"</code>.  Each of the <code>rr</code>,
 * <code>gg</code>, and <code>bb</code> values are two-digit
 * hexadecimal numbers indicating the intensity of that component.
 */

std::string convertRGBToColor(int rgb);

/*
 * Function: waitForClick
 * Usage: waitForClick();
 * ----------------------
 * Waits for a mouse click to occur anywhere in any window.
 */

void waitForClick();

/*
 * Function: exitGraphics
 * Usage: exitGraphics();
 * ----------------------
 * Closes all graphics windows and exits from the application without
 * waiting for any additional user interaction.
 */

void exitGraphics();

#include "console.h"
#include "private/main.h"

#endif
